chore: release 3.4.0 (#782)

🤖 I have created a release \*beep\* \*boop\*
---
## [3.4.0](https://www.github.com/googleapis/nodejs-dialogflow/compare/v3.3.0...v3.4.0) (2021-03-15)


### ⚠ BREAKING CHANGES

* removed ImportAgentResponse which was not ready for use yet

### Features

* add additional_bindings to Dialogflow v2 ListIntents API docs: update copyrights and session docs ([66cd3a5](https://www.github.com/googleapis/nodejs-dialogflow/commit/66cd3a5b5c605deb37efbc4f87edf17b8d4dd4c1))
* add additional_bindings to Dialogflow v2beta1 ListIntents API docs: update copyrights and session docs ([66cd3a5](https://www.github.com/googleapis/nodejs-dialogflow/commit/66cd3a5b5c605deb37efbc4f87edf17b8d4dd4c1))
* add CCAI API ([a93fa71](https://www.github.com/googleapis/nodejs-dialogflow/commit/a93fa71d45cace7822d5585a8a407e3e7e563686))
* added support for regionalization for document API ([#722](https://www.github.com/googleapis/nodejs-dialogflow/issues/722)) ([b6f5738](https://www.github.com/googleapis/nodejs-dialogflow/commit/b6f5738613fc5af49b966d4a8c4137921abed5ef))
* adds style enum ([72bb3ae](https://www.github.com/googleapis/nodejs-dialogflow/commit/72bb3aed5fbe9a605810cce69a12fd3c5e4d1fac))
* allowed custom to specify webhook headers through query parameters ([#724](https://www.github.com/googleapis/nodejs-dialogflow/issues/724)) ([a7f784a](https://www.github.com/googleapis/nodejs-dialogflow/commit/a7f784ac921a750e9df2e6edbfa3bee870187af1))


### Bug Fixes

* **browser:** check for fetch on window ([#718](https://www.github.com/googleapis/nodejs-dialogflow/issues/718)) ([fb28879](https://www.github.com/googleapis/nodejs-dialogflow/commit/fb28879443c27688d1923d6675ea97c3c5d4d0e7))
* do not modify options object, use defaultScopes ([#706](https://www.github.com/googleapis/nodejs-dialogflow/issues/706)) ([95a938d](https://www.github.com/googleapis/nodejs-dialogflow/commit/95a938dbc5f2cc49c217bb5d3cecbbffba3e6d18))
* remove MixedAudio ([a93fa71](https://www.github.com/googleapis/nodejs-dialogflow/commit/a93fa71d45cace7822d5585a8a407e3e7e563686))
* removed ImportAgentResponse which was not ready for use yet ([e0d9fa6](https://www.github.com/googleapis/nodejs-dialogflow/commit/e0d9fa69bba79540c09ec777b3eee6bf0bd5e4b6))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

dialogflow/package.json

@@ -15,7 +15,7 @@
     "test": "mocha system-test --timeout=600000"
   },
   "dependencies": {
-    "@google-cloud/dialogflow": "^3.3.0",
+    "@google-cloud/dialogflow": "^3.4.0",
     "pb-util": "^0.1.0",
     "uuid": "^8.0.0",
     "yargs": "^16.0.0"